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mpyle007 · 01-12-2012, 12:27 PM

I am about to get some headers and high flow cats for my L99. I have a GMPP axle back right now that I planned on leaving along with the factory mid pipes. I was told the factory mid pipes arent restrictive but here is my question.

In the morning when I start my car and it is cold out I hear a slight rattling. What is this caused from? If this could ever be from those mid pipes I want to eliminate this problems at the same time I install my LT's. If I did this I will probably just buy a whole cat back system. I still can not find any solid video clips of Camaros with long tubes and a gmpp axle back.

Thank you for everyone's help.

I will be buying Dynatechs, Kooks, or Texas Speed headers. Havent decided yet.

Do all of these go around the steering shaft with out having to remove it?

01-12-2012, 12:27 PM	#1
mpyle007 Drives: 2011 Camaro 2SS L99 Join Date: Jun 2011 Location: Texas Posts: 301	L99 question (Headers back) I am about to get some headers and high flow cats for my L99. I have a GMPP axle back right now that I planned on leaving along with the factory mid pipes. I was told the factory mid pipes arent restrictive but here is my question. In the morning when I start my car and it is cold out I hear a slight rattling. What is this caused from? If this could ever be from those mid pipes I want to eliminate this problems at the same time I install my LT's. If I did this I will probably just buy a whole cat back system. I still can not find any solid video clips of Camaros with long tubes and a gmpp axle back. Thank you for everyone's help. I will be buying Dynatechs, Kooks, or Texas Speed headers. Havent decided yet. Do all of these go around the steering shaft with out having to remove it? __________________ *2011 Camaro 2SS L99 A6* Rotofab CAI w/ race scoop TSP Long tube headers w/ high flow cats and full x-pipe GMPP axle back exhaust system Custom Dyno tune by ARD (Advanced Racing Dynamics) BMR 1.4" Springs all four corners "There is no replacement for displacement"